<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>First Day</title>
</head>
<body>
    <h1>这是一级标题</h1>
    <h2>这是二级标题</h2>
    <h3>这是三级标题</h3>
    <p style="color: chartreuse;">这是段落文本</p>
    <img src="./images/ikun.png" alt="ikun" width="500">
</body>
</html>